Leviticus 24:16

Overview - Leviticus 24
The oil for the lamps.
The shew-bread.
10 Shelomith's son blasphemeth.
13 The law of blasphemy.
17 Of murder.
18 Of damage.
23 The blasphemer is stoned.
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Leviticus 24:16  (King James Version)
And he that blasphemeth the name of the LORD, he shall surely be put to death, and all the congregation shall certainly stone him: as well the stranger, as he that is born in the land, when he blasphemeth the name of the LORD, shall be put to death.

As the word {nakav} not only signifies to curse, or blaspheme, but also to express, or distinguish by name, ( Numbers 1:17 . 1 ; Ch 12:31 Isaiah 62:2, ,)hence the Jews, at a very early period,
understood this law as prohibiting them from uttering the name Jehovah, on any other than sacred occasions. The Septuagint, which was made at least 250 years before Christ, renders it [Onomazon de to onoma Kyriou, thanato thanatoustho,]
"Whosoever nameth the name of the Lord, let him die;" from
which we see that the Jews at this time were accustomed to pronounce {adonay,} or Lord, instead of Jehovah; for in place of it the Septuagint always put [Lo Kyrios.] Exodus 20:7 ; 1 Kings 21:10-13 ; Psalms 74:10 Psalms 74:18 ; 139:20 Matthew 12:31 ; Mark 3:28 Mark 3:29
John 8:58 John 8:59 ; 10:33-36 Acts 26:11 ; 1 Timothy 1:13 ; James 2:7